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IM0217.2
Digital Switchover (DSO) Programme
Radio DSO Block 11C Glasgow
Document Reference: Radio DSO Glasgow–1.0
Release Date: 11 February 2011
Company Confidential
© Copyright – Arqiva Limited, 2011
The information that is contained in this document is the property of Arqiva Limited. The contents of the document must not be reproduced or disclosed wholly or in part or used for purposes other than that for which it is supplied without the prior written permission of Arqiva Limited.
Document template: m:\dab_pm\template\dsot_0102_v4-1.dot
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
© Copyright – Arqiva Limited, 2011
UNCONTROLLED COPY ONCE PRINTED
Company Confidential
Page 2 of 18
IM0217.2
Document Details
General Detail
Abstract 4C
Author Mary Smith
Verifier Brian Tait
Owner Glenn Doel
Optional Information
Author Defined Reference No Not used Project No 951224
Cross Reference
Document History
Ver Date Amendment
000A 08/03/11 Draft version for review.
001 14/03/11 Initial release
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
© Copyright – Arqiva Limited, 2011
UNCONTROLLED COPY ONCE PRINTED
Company Confidential
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IM0217.2
Table of Contents
1 Glasgow (extended to include Ayr) DSO Narrative .... .....................................4 1.1 Outgoing Interference and Sensitivity to Other Co-Block Multiplexes...................7
2 Coverage of Multiplex.............................. ..........................................................7 2.1 Existing Multiplex Considerations – Case 1 .........................................................7
2.1.1 Glasgow 11C Multiplex Considerations –Glasgow ............................................. 7 2.1.2 Ayr 11B Multiplex Considerations - Ayr............................................................... 7
2.2 Modification to Existing Infrastructure – Case 2 ...................................................8 2.3 Comparison to existing coverage – Case 3..........................................................8 2.4 Extension of DAB coverage to the Roads Network – Case 4 ...............................9 2.5 Coverage Maps ................................................................................................. 10 2.6 Population Coverage Tables.............................................................................. 16
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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1 Glasgow (extended to include Ayr) DSO Narrative
The current allocation for Glasgow is 11C and this has not been changed. The editorial area however has been significantly changed and extended. It has been extended in some places and shrunk in other areas.
The nearest co-block multiplexes are for Aberdeen and Tyne & Wear. These are shown below in Figure 1.1
Figure 1.1: Proposed 11C Block Allocation
Figure 1.2 shows the existing Glasgow editorial area (blue diagonal shading) and the existing Ayr editorial area (green diagonal shading). The proposed new Glasgow editorial area is shown by red boundary.
The Glasgow area has changed to include the entire original Ayr editorial area; Ayr is currently on air on block 11B. The revised Glasgow area now no longer includes the area to the north-east around the city of Stirling; but has been extended to include the south-west Highlands
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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IM0217.2
(including the majority of the Argyll and Bute area), including the Kintyre peninsular. The Isle of Arran is also included in the revised Glasgow editorial area.
Figure 2.1: Proposed Glasgow Allocation with existing Glasgow and Ayr Editorial Areas Shown
The combining of Glasgow and the Ayr multiplexes permits significant changes to existing infrastructure. The Glasgow - Earls Hill transmitter can be removed from the Glasgow multiplex, as it will be used for the Edinburgh 12D multiplex. The Earls Hill transmitter is entirely within the existing Edinburgh PPA (and the revised Edinburgh area) and Central Scotland Regional editorial area. The Central Scotland multiplex also uses the Earls Hill transmitter.
In additional, both the multiplexes currently use the Darvel transmitter site, but with different antennas at different heights. The current transmission characteristics for Ayr are shown in table 1.1, and the current transmission characteristics for Glasgow are shown in table 1.2.
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
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In planning for each multiplex Ofcom have required coverage assessments:
• For each area four maps should be produced as follows:
1. Current Situation - Map showing current actual coverage (or launch plans where a mux hasn’t yet launched), including any transmitters which are required as part of the current licence, but which are not yet operational.
2. Modified Network 1 - Map showing the above, plus any improvements to existing infrastructure.
3. Modified Network 2 - Map of the above, plus additional smaller infill transmitters focused on areas where FM coverage is robust.
4. Modified Network 3 - Map of the above, plus additional transmitters to provide near universal coverage.
The current situation is shown in tables 1.1 and 1.2. The case 1 scenarios for Glasgow and for Ayr are shown in tables 1.1 and 1.2. The coverage for Glasgow 11C case 1 is shown in figure 2.1 and the coverage for Ayr 11B case 1 is shown in figure 2.2.
Site name ERP Site height m a.o.d.
Antenna height m a.g.l.
Antenna type
Brown Carrick Hill 4 kW 273 30 Cardioid
Darvel 750 W 285 152 Cardioid
West Kilbride 1.51 kW 169 34 Yagis
Table 1.1: Ayr 11B Current Transmission Characteristics
Site name ERP Site height m a.o.d.
Antenna height m a.g.l.
Antenna type
Black Hill 4.23 kW 277.5 292 Cardioid
Sergeant Law 886 W 230 32 Screened dipoles
Darvel 1 kW 285 148 Cardioid
Earls Hill 250 W 415 37 Cardioid
Table 1.2: Glasgow 11C Current Transmission Characteristics
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
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Case 2: Modified Network 1
By combining these two multiplex regions, the changes contemplated are, using three of the four Glasgow sites ‘as is’ Black Hill, Darvel and Sargeant Law, and not using Earl’s Hill, which is now outside the revised editorial boundary. Also using two of the three Ayr sites, with no change (except for rechanneling from 11B to 11C) ‘as is’; West Kilbride and Brown Carrick Hill. The choice of using Glasgow’s Darvel antenna; is based on trying to minimise potential interference to Eire.
1.1 Outgoing Interference and Sensitivity to Other Co-Block Multiplexes
The expanded Aberdeen and Tyne & Wear multiplexes are largely unaffected by additions proposed to expand the extended Glasgow multiplex. In additional, the proposed increases in the extended Glasgow coverage is not predicted to be significantly impacted by these co-block transmissions within the United Kingdom, however there may be outgoing impact on 11C usage in Eire.
2 Coverage of Multiplex
2.1 Existing Multiplex Considerations – Case 1
2.1.1 Glasgow 11C Multiplex Considerations –Glasgow
The existing coverage from Glasgow is show in Figure 2.1 – Case 1 – Glasgow.
2.1.2 Ayr 11B Multiplex Considerations - Ayr
The existing coverage from Ayr 11B is show in Figure 2.2 Case 1 – Ayr.
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
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2.2 Modification to Existing Infrastructure – Case 2
Increasing the DAB coverage for the Glasgow multiplex over this new area, some consideration has been given to modifying the existing Glasgow and Ayr transmitters, and no changes are proposed.
It is proposed that the Ayr 11B, Darvel antenna should become redundant, with the new extended 11C Glasgow multiplex using the Glasgow antenna.
For Brown Carrick Hill and West Kilbride, the only modification proposed is the change of frequency block, from 11B to 11C
The Darvel site, with two different antennae, is in use by both Ayr 11B and Glasgow 11C multiplexes, it is proposed that the extended Glasgow DSO should use Glasgow antenna, mainly to minimise potential interference to Eire.
Case 2, modified existing network 1, and is derived from combining two Ayr transmitters and three Glasgow transmitters, this is shown in Figure 2.3. There is a difference between the indoor and outdoor 1% interference limited coverage, the indoor coverage is predicted to be higher than the outdoor coverage due to extensive A road networks in un-populated areas.
2.3 Comparison to existing coverage – Case 3
In order to improve coverage and emulate coverage that more closely echoes the robust VHF coverage throughout the expanded Glasgow editorial area, the Glasgow city centre a site at the Glasgow Hilton has been added to the proposed DSO plan. The Glasgow Hilton site is also likely to be of interest for use by BBC, Digital 1 and Central Scotland multiplexes.
Additionally the following existing FM sites have been added to the DSO plan:-
Campbeltown, Girvan, Millburn Muir, Rosneath, Rothesay, South Knapdale and Strachur. The BBC national DAB service is either using or planning to use the following sites: - Millburn Muir, Rosneath, Rothesay and South Knapdale.
This is shown in Figure 2.4 “Case 3 Modified Network coverage-interference limited 1% time.”
There is a difference between the indoor and outdoor 1% interference limited coverage. The indoor coverage is predicted to be higher than the outdoor coverage. This is exacerbated by large expanses between the populated areas for this multiplex.
The case 3 scenario does not give particularly high coverage to the roads network.
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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2.4 Extension of DAB coverage to the Roads Network – Case 4
In order to improve the mobile outdoor coverage, the following transmitter sites have been considered:-
Abington, Arrochar, Ballantrae, Biggar, Blackwaterfoot, Clachan, Dalmally, Pinwherry and Kirkfieldbank.
The only transmitters that have been included from this list are (in order of population increase) are: - Biggar, Kirkfieldbank, Abington, Arrochar and Ballantrae. Arrochar and Ballantrae add less than 500 households each to the overall population, but do provide some strategic benefit to the roads network, Ballantrae to the south of Girvan on the coast and Arrochar to the north; providing a some additional roads coverage in a sparsely populated region in the hills to the north of Glasgow, but on one of the major routes through the area. The use of Ballantrae will provide coverage along some of the coast road to the south, for those drivers en route to Dumfries and the port at Stranraer. This coverage is shown in Figure 2.5.
Some of these transmitters have been left with omni-directional characteristics at the moment; many of these transmitters are likely to be limited by the local terrain, and detailed transmission characteristics have not been developed at this time.
Kirkfieldbank is also being considered for use by the Central Scotland multiplex.
There are some differences between the indoor and mobile outdoor 1% time interference limited coverage’s, the indoor coverage is predicted to be higher than the outdoor coverage but with these extra sites the gap has narrowed. This is exacerbated by large expanses between the populated areas for this multiplex.
The coast road on the western part of the Mull of Kintyre is very difficult to serve from within the Glasgow editorial area; it may be possible to serve this area from the Inverness editorial area (Islay transmitters). Re-allocating the Islay transmitters from Inverness multiplex to Glasgow would make coverage on the main A83 coastal route would make the journey to Campbeltown contiguous.
The population centres are well served, however, the extensive roads network through unpopulated areas means that the roads coverage is lower (as a percentage) than the households populations. Given the significant areas within the editorial area that are predominantly unpopulated and the road network within this editorial area is untypically extensive, further numerous additional roadside transmitters that would serve minimal or zero additional population have not at this time been considered further.
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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2.5 Coverage Maps
These maps included with this report are
Figure 2.1 Glasgow 11C Existing Case 1 interference limited coverage 1%
Figure 2.2 Ayr 11B Existing Case 1 interference limited coverage 1%
Figure 2.3 Case 2 Modified Network 1- Existing Ayr Existing (2 txs) & Glasgow (3 txs) interference limited coverage 1%
Figure 2.4 Case 3 – Modified Network2, interference limited coverage 1%
Figure 2.5 Case 4 - Modified Network 3 - Interference Limited 1%
Coverage maps for DAB are presented with three colours.
Blue = Mobile coverage (99% locations at 99% time)
Dark Green = Indoor coverage (80-95% locations at 99% time)
Light Green = Robust Indoor coverage (>95% locations at 99% time)
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
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Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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UNCONTROLLED COPY ONCE PRINTED
Company Confidential
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IM0217.2
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
© Copyright – Arqiva Limited, 2011
UNCONTROLLED COPY ONCE PRINTED
Company Confidential
Page 13 of 18
IM0217.2
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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Company Confidential
Page 14 of 18
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Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
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Company Confidential
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IM0217.2
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
DSO Programme
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Company Confidential
Page 16 of 18
IM0217.2
2.6 Population Coverage Tables
The following population tables Table 2.1 and Table 2.2 are colour coded thus:-
Existing Glasgow (4 transmitters) - Light Yellow = Glasgow existing sites unchanged)
Existing Ayr (3 transmitters) - Light Pink = Ayr existing sites unchanged
Case 1 (5 transmitters) - Light Blue = Modified Network 1.
Three Glasgow transmitters plus Two Ayr Transmitters (on 11C)
Case 2 (13 transmitters) - Light Blue + orange = modified network 2
Case 3 (18 transmitters) - Light Blue + orange + green = modified network 3
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
Released: 11 February 2011
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Table 2-1 . Population coverage proportional indoor 99%T: Total 1054463
Site scenario and
incremental additional
sites
Site Type Individual Gross
Interference Limited
coverage within
Editorial Area
Number of households
within Editorial
Area
Increase in number of
households
Incremental percentage increase of population
Percentage of Editorial
Area
Current Glasgow Mux
(4 Tx)
Existing infrastructure
802254 76.08
Current Ayr Mux
(3 Tx)
Existing infrastructure
151235 14.34
Modified Glasgow
(3txs) PLUS Ayr (2txs)
Shared Existing
Infrastructure
883568 83.79
Glasgow Hilton
New city centre site
291356 (27.63%)
929649 48081 4.37 88.16
Rosneath VHF site 56840 (5.39%)
970744 41095 3.9 92.06
Millburn Muir “ 33584 (3.18%)
982615 11871 1.13 93.19
Rothesay “ 12951 (1.235)
995131 12516 1.18 94.37
Girvan “ 16791 (1.59%)
1001597 6466 0.62 94.99
South Knapdale
“ 26435 (2.51%)
1006556 4959 0.47 95.46
Campbeltown “ 3707 (0.35%)
1010240 3684 0.35 95.81
Strachur “ 893 (0.08%)
1011155 915 0.09 95.89
Biggar Extra sites 4444 (0.42%)
1014709 3554 0.34 96.23
Kirkfieldbank “ 33264 (1.53%)
1016268 1559 0.15 96.38
Abington “ 516 (0.05%)
1017222 954 0.39 96.47
Arrochar “ 419 (0.04%)
1017691 469 0.04 96.51
Ballantrae “ 430 (0.04%)
1018088 397 0.04 96.55
Radio DSO Block 11C Glasgow Radio DSO Glasgow–1.0
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Table 2-2. Road coverage 99% locations, 99%T: Total 2171 km
Site scenario and
incremental additional
sites
Site Type Total road length in
km
Increase in number of road length
in km
Incremental percentage increase of road length
Percentage of roads
within the editorial
area
Site scenario
and incremental additional
sites
Current Glasgow Mux
(4 Tx)
Existing infrastructure
1160 53.4
Current Ayr Mux
(3 Tx)
Existing infrastructure
540 24.9
Modified Glasgow
(3txs) PLUS Ayr (2txs)
Shared Existing
Infrastructure
1321 60.9
Glasgow Hilton
New city centre site
295.958 1335 13.8 0.63 61.5
Rosneath VHF site 137.882 1416
6.2 3.7 65.2
Millburn Muir “ 91.083 1435
19.2 0.28 66.1
Rothesay “ 83.4 1494
59.8 2.65 68.8
Girvan “ 92.210 1518
23.7 1.1 69.9
South Knapdale
“ 241.428 1598 81.3 3.66 73.6
Campbeltown “ 10.731 1608
11.7 0.5 74.1
Strachur “ 43.572 1640
31.7 1.46 75.6
Biggar Extra sites 61.819 1692
38.2 2.40 77.9
Kirkfieldbank “ 33.264 1705
12.3 0.57 78.5
Abington “ 46.487 1750
45.7 2.1 80.6
Arrochar “ 25.299 1775
24.4 1.12 81.7
Ballantrae “ 11.244 1781
7.7 0.69 82.1